The phrase "a primary competitor of" is correct and usable in written English.
It can be used when discussing businesses or entities that compete with one another in a specific market or industry.
Example: "Company A is a primary competitor of Company B in the technology sector."
Alternatives: "a key rival of" or "a major competitor of".
Earlier today Google announced its acquisition of Adometry – a primary competitor to Convertro – in yet another affirmation of our position as one of two primary platform competitors.
They have also said that within the world of exchange-traded derivatives, the market share of a combined Liffe-Eurex would be 19 percent, smaller than that of a primary competitor, the CME Group.
Though there has been dissension between Google and Android over use of the open source stack, Google is always the last person you want as a primary competitor.
The other online software retailer, Minneapolis, Minn.-based Chumbo.com, which is the primary competitor of San Jose, Calif.-based Calif.-based Beyond.comxing its muscles, and getting a helping hand from some of the byndboys.
NBC Universal and Fox won't likely provide content to the primary competitor of Hulu, their own video venture.
Disclosure: I record a podcast with Hodinkee's primary competitor, Ariel Adams of ABlogToWatch and I like everybody involved including John Mayer.
Meanwhile, too many of Trump's GOP primary competitors, afraid of angering his fans, stand mute or mumbling.
Competition: TruantToday's primary competitor is SchoolMessenger, a service of Reliance Communications, which was founded in 1999 and is based in Santa Cruz, Calif.
He sought out Vmark's primary competitor, a private company, and quickly arranged to meet with its owner to talk about a merger of equals.
Last year the Michigan firm bought its primary competitor, a German company called W.E.T. Automotive Systems.
